diff --git a/uncloud/hack/vm.py b/uncloud/hack/vm.py
index e1b2f81..7804d18 100755
--- a/uncloud/hack/vm.py
+++ b/uncloud/hack/vm.py
@@ -100,6 +100,7 @@ class VM(object):
     def create(self):
         # New VM: new UUID, new MAC.
         self.uuid = str(uuid.uuid4())
+        self.mac=MAC(self.config)
         self.mac.create()
 
         qemu_args = self.get_qemu_args()
@@ -110,7 +111,7 @@ class VM(object):
                 *qemu_args
                 )
 
-        self.mac=MAC(self.config)
+
         self.mac.create()
         self.vm['mac'] = self.mac
         self.vm['ifname'] = "uc{}".format(self.mac.__repr__())
@@ -159,4 +160,3 @@ class VM(object):
 
     def list(self):
         print(self.vmm.discover())
-